Yes. You can become a pediatrician with any major. Admissions committees care more about your GPA than your major. Here's a great Princeton Review article on the subject:
My classmates ranged from biology and chemistry to dance majors.
This professional recommends the following next steps:
- Find the classes that give you the most joy and major in that area.
- Make sure you take all the medical school prerequisites by the middle of junior year of college.